## Precalculus (6th Edition)

$d=20$ miles
RECALL: For situations involving time (t) , distance (d) and rate (r, sometimes referred to as speed), the formula for distance is: $d=rt$ The given situation has: $r=80$ mph $t =15$ minutes = $\dfrac{1}{4}$ hour Use the formula above to obtain: $d=rt \\d=80(\frac{1}{4})$ $\\d=20$ miles